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WASHINGTON, DC - APRIL 27: U.S. Defense Secretary Ashton Carter (R) and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford Jr. (L) testify during a hearing before the Defense Subcommittee of Senate Appropriations Committee April 27, 2016 on Capitol Hill in Washington, DC. The subcommittee held a hearing on the FY2017 budget for the Defense Department. (Photo by Alex Wong/Getty Images)